Sexual assault is an act in which a person intentionally sexually touches another person without that person's consent, or coerces or physically forces a person to engage in a sexual act against their will.
Jaba forcing Leia to wear revealing clothing, restraining her, and then making advances such as trying to lick her body, were unwanted sexual advances.
As I remember, C3PO translated something whch Jabba said as meaning that people fed to the sarlacc would be slowly digested over a thousand years.
So Jabba claimed that victims of the sarlacc would take many centuries to be digested. And I think the implication was that they would somehow be alive and in pain for those many centuries.
I don't know wheter ...
I've decided to add my own. It contains references to some things pointed by others and a few more I haven't seen anyone pointing - specifically, the Windu event (which mirrors this scene, and I think this is the key), which paired with Dooku's I think gives a stronger feel of what was happening:
The reason were:
Darkside philosophy - The rule of two